Residential clustering of COVID-19 cases and efficiency of building-wide compulsory testing notices as a transmission control measure in Hong Kong.

We described the frequency of residential case clusters and the efficiency of compulsory testing in identifying cases using buildings targeted in compulsory testing and locally infected COVID-19 cases matched by residence in Hong Kong. Most of the buildings (4246/7688, 55.2%) with COVID-19 cases identified had only one reported case and 13% of the daily reported cases were detected through compulsory testing. Compulsory testing notices could be essential in attempting to eliminate infections ('zero covid') and impactful early in an epidemic but appears to be relatively inefficient in response to sustained community transmission.

Analysis of COVID-19 clusters involving vertical transmission in residential buildings in Hong Kong.

Multiple clusters of coronavirus disease 2019 (COVID-19) in Hong Kong have involved vertical transmissions in residential buildings, wherein the flats of confirmed cases were often vertically aligned. Data on the buildings and cases associated with 19 such clusters were retrieved and compared with the corresponding data on the entirety of Hong Kong. Vertical transmissions usually occurred in old high-rise buildings with small flat areas and low estate prices during winter. In addition, infection occurred frequently among the elderly and among upstairs neighbours of index cases. Virus-laden aerosols may have been transmitted between flats mostly via shared drainpipes, and the vertical distribution of the confirmed cases in a building varied by its drainage system design. For buildings with their entire drainpipes installed indoors, both the upstairs and downstairs neighbours of the index case flats could be infected. By comparison, buildings with their drainage stacks installed outdoors had lower infection risks and demonstrated a clearer pattern of vertical transmission: most infected cases resided upstairs from the index case flats, indicating that the virus spread could be dominated by the stack effect. This study provides valuable data and analysis for developing epidemic control strategies for residential buildings. Electronic Supplementary Material ESM: The Appendix is available in the online version of this article at 10.1007/s12273-022-0929-5.

Some recent developments and testing strategies relating to the passive fire protection of concrete using intumescent coatings: a review

PurposeIn the present article, the authors have conducted a review on some of the recent developments given in the literature pertaining to the passive protection of concrete structures using intumescent coatings. Here, the main thrust is placed on the spalling phenomenon of concrete elements when exposed to elevated temperatures and fires.Design/methodology/approachIn this context, it has been long established that prolonged thermal insult on concrete members will lead to egress of water, both physically bound as well as those present as water of hydration within the concrete matrix, in the form of steam through microchannels and associated pathways of least resistance, often resulting in the flaking of the surface of the structure. The latter process can ultimately lead to the exposure of the ferrous-based reenforcement elements, for instance, to higher temperatures, thus inducing melting. This, in turn, can result in substantial loss of strength and load-bearing capacity of the structural element that is already undergoing disintegration of its base matrix owing to heat/fire. Even though spalling of concrete structures has long been recognized as a serious problem that can often lead to catastrophic failure of infrastructures, such as buildings, bridges and tunnels, the utility of intumescent coating as a mitigation strategy is relatively new and has not been explored to its fullest possible extent. Therefore, in the latter parts of the review, the authors have endeavored to discuss the different types of intumescent coatings, their modes of actions and, in particular, their wider applicability in terms of protecting concrete elements from detrimental effects of severe or explosive spalling.FindingsGiven that spalling of concrete components is still a very serious issue that can result in loss of lives and destruction of critical infrastructures, there is an urgent need to formulate better mitigating strategies, through novel means and methods. The use of the intumescent coating in this context appears to be a promising way forward but is one that seems to be little explored so far. Therefore, a more systematic investigation is highly warranted in this area, especially, as the authors envisage a greater activity in the building and commissioning of more infrastructures worldwide incommensurate with augmented economic activities during the post-COVID recovery period.Originality/valueThe authors have conducted a review on some of the recent developments given in the literature pertaining to the passive protection of concrete structures using intumescent coatings. The authors have also included the results from some recent tests carried out at the facilities using a newly commissioned state-of-the-art furnace.

Spatial Identification, Prevention and Control of Epidemics in High-Rise Residential Areas Based on Wind Environments

The wind environment in residential areas can exert a direct or indirect influence on the spread of epidemics, with some scholars paying particular attention to the epidemic prevention and control of residential areas from the perspective of wind environments. As a result, it is urgent to re-examine the epidemic prevention response of residential spaces. Taking high-rise residential areas in Xi'an as an example, the article defines the air flow field area based on on-site wind environment measurements, crowd behavior annotation, and CFD simulation. Using the double-effect superposition of crowd behavior and risk space, the paper undertook a multiple identification strategy of epidemic prevention space. The identification methods and management and control strategies of epidemic prevention in high-rise residential areas are proposed. Additionally, the living environment of residential areas is optimized, and a healthy residential space is created. The transformation from concept and calls for action to space implementation is made to provide a reference for improving the space management and control capabilities in high-rise residential areas in China. The results of this study can be used as a guideline for future residential planning and design from the perspective of preventing airborne diseases.

Community centres in increasingly diverse neighbourhoods: policies and practices of community building in post-war housing estates in Switzerland

This paper uses research conducted in Swiss post-war high-rise estates to focus on policies and practices of community building in neighbourhoods with an increasingly diverse population. Initially, the estates were mainly populated by Swiss and Southern European lower to middle income families, but latterly the household structures have become very heterogeneous with residents coming from all over the world. The planning and development policies of the estates are based on specific ideas about creating a community, which are still evident in the building and management of community centres but also in various facilities for common use (playgrounds, football and sport fields, community rooms and kitchens, libraries, petting zoos, cafés, crafts rooms, etc.). The community centres, along with community work, are key to encouraging encounters, connecting people and activating cultural life in the neighbourhoods and have played a pioneering role far beyond the boundaries of their respective estates. However, individualisation and pluralisation processes, the aging of the facilities and built structures, and economic pressures pose challenges for the community centres. The current Covid-19 crisis reinforces these challenges by limiting and impeding cultural activities and direct (physical) social encounters. The paper analyses the potential and the challenges of community building in the context of growing diversity among residents, and acknowledges what we can learn from these experiences when thinking about creating and strengthening communities in a multi-faceted world today. Copyright © 2022 (Althaus, E., Christensen, L.)

Local perspectives on the cultural significance of rejuvenated heritage shophouses in George Town, Penang

PurposeThis research presents a comparative perception study towards rejuvenated, community-driven shophouses in George Town, Penang.Design/methodology/approachIt captures the opinions of two distinct age groups by utilizing a mixed-methods approach encompassing quantitative (main) and qualitative (supporting) research to obtain a dynamic understanding of perceptions between younger and older residents in the city and how these impact the long-term sustainability of heritage conservation efforts. The distribution of questionnaires to residents of Penang was the primary data collection method, with the structure of the questionnaires supported by recent academic literature and past perceptional research studies about built heritage.FindingsThe four main findings from the study are therefore as follows: 1. Both age groups have a similar, positive perception towards the tangible, physical elements of rejuvenated shophouses. 2. Intangible, functional factors play an equal or stronger role in influencing people and their attitude towards public participation and overall "Sense of Place”. 3. The pessimistic "Sense of Place” responses from the "Older” group reflect an equally pessimistic attitude towards intangible, functional factors surrounding rejuvenated shophouses. 4. Youth-led changes to George Town's heritage shophouses are degrading the "sense of place” connecting the older generation to the city.Originality/valueThe study can serve as a guide for the development of more inclusive and socially sustainable conservation and adaptive re-use policies for safeguarding the heritage identity and value of shophouses for current and future generations to experience in a post-COVID world.

Situation Awareness Based Smart Contract for Modular Construction

Modular construction has been implemented to achieve shorter project duration, lower cost, and higher productivity for construction projects. This option is especially helpful to reduce on-site activities and interaction under and after COVID impact. However, additional planning and support in engineering, procurement, and delivery are required to facilitate modular construction. Unreliable prefabrication and delivery can deteriorate subsequent activity productivity and overall project performance. This research aims to develop an automatic incentive—penalty enforcement system for modular construction based on the situation awareness of delivery tracking. The research selected a high-rise residential project in Singapore as a case study. The project used modular construction for making and installing 120 Prefabricated Bathroom Units. Based on the empirical data of delivery, on-site lifting, and installation, we built STROBOSCOPE simulation models to understand the impact on productivity and schedule from five scenarios at various delivery reliability levels of the Prefabricated Bathroom Units. Smart Contract rules were developed based on the impact. A Blockchain platform was established so that once a real-time delivery is identified and the information is entered into the Smart Contract, the associated incentive or penalty can be triggered instantly. The Smart Contract based incentive—penalty enforcement system will be beneficial for construction projects to monitor and track modular delivery, motivate reliable supply, reduce payment disputes, and improve productivity. © 2023, Canadian Society for Civil Engineering.

High-Rise Residential Outdoor Space Value System: A Case Study of Yangtze River Delta Area.

The outbreak of COVID-19 has drawn wider attention from residents with growing demand for outdoor space in residential areas because of restrictions on residents' mobility, especially in China. However, the high-rise residential complex in China is featured with a high population density along with less outdoor space per household. This means that the current status of outdoor space in residential areas is far from satisfying residents' growing needs. This is consistent with our preliminary survey that highlights general low satisfaction of residents with outdoor space. According to the hierarchical theory of needs, a literature review, and a questionnaire survey, a framework is proposed in this study to examine the universal value system of high-rise residential outdoor space using the Yangtze River Delta Area as a case study. This framework consists of six dimensions, i.e., space physical comfort (physical environment and space size), space function (functional complexity and scale, age-range, and time-range), space safety (daily, social, and hygiene safety), space diversity (spatial layerings, forms, and scales diversity), accessibility (spatial attraction and concentration and path clarity) and sustainability (cultural, social, ecological, and financial sustainability). Consequently, a questionnaire was designed according to the framework and 251 valid questionnaires were received. Then, structural equation modeling (SEM) was undertaken to examine the impact of each dimension on the value of outdoor space and the framework was optimized into four dimensions, i.e., space physical comfort, space function, space safety, and DAT (space diversity, accessibility, and sustainability). Finally, the mechanism of how outdoor space quality influences the high-rise residential complex is analyzed. These findings provide useful input for the future planning and design of high-rise residential areas.

Investigating natural ventilation performance on apartment units in Jakarta based on field test measurements

The COVID-19 pandemic has changed the way of living of many people across the planet. In the beginning of the pandemic, when the strict lockdown was implemented, numbers of individual were encouraged to work from home. In the city living, high rise living was apparent and became a global phenomenon. This paper evaluates natural ventilation performances of existing apartment units in Jakarta, Indonesia by measuring the indoor temperature, indoor airflow and relative humidity. This research studied three different apartment units in Jakarta in the form of single-sided ventilation or cross ventilation. This study conducted by field test measurement on three different apartment units across Jakarta with various natural ventilation strategy and room volume. Statistical analysis was carried out to investigate the relationship and influence between the results of field test measurement and external weather data collected from ERA5. The results of the analysis suggested that external weather influence the indoor air condition, especially indoor temperature where significant influence was apparent. Furthermore, the field test data measurement in this paper contributed to validation study in predicting indoor airflow. © 2022, University of Malaya. All rights reserved.

“Double Ageing” in the High-Rise Residential Buildings of Tokyo

This study aims to explore the current “double ageing” (demographic ageing of residents and physical ageing of facilities) in high-rise (over 20 stories by the Japanese Government’s definition) residential buildings in Tokyo, where the rate of ageing has increased most rapidly since the late 1990s, compared to those of other cities and high-rise residential buildings worldwide. First, the trend of demographic ageing in the districts where high-rise residential buildings are concentrated is analysed. The results show that demographic ageing in high-rise residential buildings is faster than in other residential buildings because the age group of the residents is concentrated across two generations: the generation born in 1946–1955 and the generation born in 1966–75. Second, the relationship between demographic and physical ageing was examined through an online survey of 978 residents of high-rise residential buildings conducted in January 2021. A generation gap in values regarding their high-rise residential buildings was clearly identified. Third, the cause and result of the generation concentration and gap were investigated via an interview survey of 26 informants extracted from the online survey. Three main findings emerged: (a) the ageing of the generation born in 1946–1955 has given rise to housing insecurity because of the decline in income, (b) the high rate of singles within the generation born in 1966–1975 may be as a result of housing insecurity after their retirement, and (c) the introduction of social distancing has accelerated the substantial “ageing” of relatively good facilities, but a straightforward generational conflict was not fully deciphered in this article because of lifestyle diversification over generations and organisational culture of management associations. © 2022 by the author(s);licensee Cogitatio (Lisbon, Portugal).

Common Areas, Common Causes: Public Space in High‐Rise Buildings During Covid‐19

This article explores forms of public space that have been rendered palpable during the Covid‐19 pandemic: public spaces in high‐rise buildings. We consider both physical and social public space in this context, thinking about the safety of both common areas and amenities in buildings and the emergence of new publics around the conditions of tower living during the pandemic (particularly focusing on tenant struggles). We determine that the planning, use, maintenance, and social production of public space in high‐rise buildings are topics of increasing concern and urgency and that the presence of public space in the vertical built forms and lifestyles proliferating in urban regions complicates common understandings of public space. We argue that the questions raised by the pandemic call upon us to reconsider the meanings of public space. © 2022 by the author(s);licensee Cogitatio (Lisbon, Portugal).

Increasing Ventilation In 1980s High-Rise Commercial Office Buildings

The COVID-19 pandemic has driven public interest in building ventilation rates. The ASHRAE Epidemic Task Force's recommendation that buildings "provide and maintain at least the minimum outdoor airflow rates for ventilation as specified by applicable codes and standards" put quantitative ventilation system assessments in high demand. Throughout the pandemic, many building owners conducted assessments of building systems, including ventilation, to reduce risk of COVID-19 transmission. A recent study of assessments at 95 commercial office buildings found that 77% provided minimum ventilation rates or could make minor adjustments to do so. However, 23% of buildings were underventilated and would require significant capital investment to meet current standards. All but one of these buildings were designed between 1981 and 1992, with ventilation rates as low as 9 cfm/person (4 L/s person) (assuming default occupant density).

System Dynamic Simulation to Determine The Effect Of Water Consumption on Land Subsidence During Covid-19 Pandemic in Jakarta

Excessive groundwater extraction is believed to be one of the main factors for land subsidence which may be caused by tidal flooding due to the position of the surface which is lower than sea level. Covid-19 pandemic that has occurred in Indonesia since March 2020 has caused changes in water consumption patterns which derives from piped water and groundwater. There are many offices and industries that implement work from home (WFH) makes many buildings have a declining occupancy rate. With the decrease in the occupancy rate of the WFH policy, there will be a possibility that groundwater consumption from high-rise buildings that draw groundwater from deep aquifers can be reduced. This research is in the form of modelling and simulation that is used to build a level of understanding on a whole system as well as the interrelationships and interactions between its constituent variables. The purpose of this research was to determine the effect of groundwater consumption during Covid-19 pandemic on land subsidence in Jakarta using the dynamic system simulation method. The results showed that the work from home policy reduces groundwater consumption by 64.7%. In addition, the reduction in groundwater consumption during the Covid-19 pandemic caused land subsidence in Jakarta slows down and the rate of land subsidence in Jakarta decreased from 3.7 cm/year to 1 cm/year.

Cooling-related energy uses and adaptive behaviors in high-rise residential buildings in the subtropical climate: A case study in Hong Kong

The growing urban population has accelerated the development of high-density cities and high-rise buildings. Meanwhile, cooling energy use is expected to increase, especially in (sub)tropical areas, due to climate change, the rising ownership rate of air-conditioners, and working-from-home during the Covid-19 pandemic. Thus, reducing cooling energy use in high-rise residential buildings is essential for achieving net zero by 2050. However, limited empirical studies are available on cooling energy use of high-rise residential buildings. This study aims to investigate cooling-related energy uses and adaptive behaviors in high-rise residential buildings, particularly, the vertical variation of energy uses and relevant factors. A high-rise student residence in Hong Kong was examined. Four-year electricity meter records in 716 rooms were analyzed to check the statistical significance of the vertical cooling electricity use difference. Long-term in-situ monitoring was applied to obtain environmental and behavioral data with twenty-one residents. A validated building energy model was used to explain the vertical cooling energy use difference. Results show that the annual cooling electricity use declined averagely by 0.8% per floor, which could be mainly explained by the environmental and behavioral factors that changed with building height. The findings will facilitate decision-making on energy efficiency in high-rise residential buildings.

UV-C VentGuard: An IoT-based Monitoring and Disinfection System for Pathogen Inactivation in Ventilation Pipes of High-rise Buildings

SARS-CoV-2 traveling through ventilating pipes in high-rise buildings present an urgent concern to address. This paper describes an IoT monitoring system designed to disinfect the air traveling through the pipes. Site tests demonstrate that the system provides a cost-effective solution for pathogen inactivation in ventilating pipes of high-rise buildings, and that it can play a positive role in mitigating the spread of the COVID-19 pandemic in built environments. © 2021 IEEE.

Vertical outbreak of COVID-19 in high-rise buildings: The role of sewer stacks and prevention measures.

COVID-19 outbreaks in high-rise buildings suggested the transmission route of fecal-aerosol-inhalation due to the involvement of viral aerosols in sewer stacks. The vertical transmission is likely due to the failure of water traps that allow viral aerosols to spread through sewer stacks. This process can be further facilitated by the chimney effect in vent stack, extract ventilation in bathrooms, or wind-induced air pressure fluctuations. To eliminate the risk of such vertical disease spread, the installation of protective devices is highly encouraged in high-rise buildings. Although the mechanism of vertical pathogen spread through drainage pipeline has been illustrated by tracer gas or microbial experiments and numerical modeling, more research is needed to support the update of regulatory and design standards for sewerage facilities.

Situation Awareness Based Smart Contract for Modular Construction

Modular construction has been implemented to achieve shorter project duration, lower cost, and higher productivity for construction projects. This option is especially helpful to reduce on-site activities and interaction under and after COVID impact. However, additional planning and support in engineering, procurement, and delivery are required to facilitate modular construction. Unreliable prefabrication and delivery can deteriorate subsequent activity productivity and overall project performance. This research aims to develop an automatic incentive—penalty enforcement system for modular construction based on the situation awareness of delivery tracking. The research selected a high-rise residential project in Singapore as a case study. The project used modular construction for making and installing 120 Prefabricated Bathroom Units. Based on the empirical data of delivery, on-site lifting, and installation, we built STROBOSCOPE simulation models to understand the impact on productivity and schedule from five scenarios at various delivery reliability levels of the Prefabricated Bathroom Units. Smart Contract rules were developed based on the impact. A Blockchain platform was established so that once a real-time delivery is identified and the information is entered into the Smart Contract, the associated incentive or penalty can be triggered instantly. The Smart Contract based incentive—penalty enforcement system will be beneficial for construction projects to monitor and track modular delivery, motivate reliable supply, reduce payment disputes, and improve productivity. © 2023, Canadian Society for Civil Engineering.

Post-Pandemic HVAC Systems Strategies For High-Rise Office Buildings

The impact of the COVID-19 pandemic on building design and strategy will be as revolutionary as the rise of the first skyscraper. COVID-19 and potential future pandemics have forever changed the design approach and methodology for high-rise office buildings. Heating, ventilation and air-conditioning (HVAC) operational changes since the onset of the pandemic have been important to improve wellness and increase occupant comfort. These include moves recommended by ASHRAE (such as more outside air, better filters), along with air-cleaning technologies that can readily be added to existing systems, such as Ultraviolet Germicidal Irradiation (UVGI) and Bipolar Ionization (BPI). But what if future tall buildings were designed to better respond to a pandemic from the start? Moving forward, high-performing buildings should be configured with mechanical systems that minimize or eliminate air mixing between floors. They should optimize ventilation effectiveness within the space. In the increasingly connected world, intelligent sensors can provide air quality data that is useful for both operators and occupants. With forward-thinking transparency, the data can be compiled into meaningful metrics and shared with occupants to give them insight into building operations and performance. © 2020, Council on Tall Buildings and Urban Habitat. All rights reserved.

The Tall Building Strategically Reconsidered— Seattle 2030: The Post-Crisis Tower

The current perception of a post-COVID world is highly divisive and despairing. The “death of the tall building” is touted by prognosticators as a fait accompli. The concept of the city as a microcosm of commerce, urban living, culture, and civic uses has been put into severe doubt and paranoia. Density, mass transit and assembly uses are suddenly deemed as anathema to “normal” lifestyles, and the flight to the suburbs is touted as the new mantra. This paper is an exploration of what a post-crisis vertical vision would reflect in urban America, responding to changing norms of the workplace, urban living, leisure, and transit. Its prototype is a hybrid 400-meter mass timber structure ensconced within a steel exoskeletal frame. With 90 percent of the tower comprised of mass timber, the 88-story structure would sequester carbon, reduce emissions, enhance structural performance and set new paradigms of the tall building as a modular, living-breathing machine, responding to the “new normal” of the contemporary urban condition. © 2020, Council on Tall Buildings and Urban Habitat. All rights reserved.

Implementation of Occupational Safety and Health Management Systems During COVID-19 Pandemic on High-Rise Building Construction Projects

Indonesia is one from many countries that is struck by the COVID-19 virus pandemic. Indonesia still needs to recover from economy crisis caused by the pandemic. Indonesia’s evolvement can be seen from their development in their infrastructure during the COVID-19 pandemic. The Occupational Safety and Health (OHS) Management System is a crucial part of the contractor organization’s management system that is used to implement and develop OHS policies in all of the existing development project. In this research study, it will discuss about the application of OHS management systems in high-rise building projects during the COVID-19 pandemic. The result from the analysis and calculation in this research are compared with the Minister of Public Works Regulation No. 9/2008 regarding the Management System and Work Safety and the Instruction of the Minister of PUPR No. 2/IN/M/2020 concerning about the Protocol to Prevent the Spread of Corona Virus Disease 2019 (COVID-19) in the implementation of construction services. In its implementation, the OHS Management System is divided into 3 important parts, namely the Implementation and Operation of OHS Activities, OHS Evaluation/Inspection and OHS Management Review. The implementation of OHS Management System during the COVID-19 pandemic in high-rise building was obtained 77.09% (Good Enough). © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.